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Fast Green FCF

Fast Green FCF

Ionisation: Acid

Chemical structure of Fast Green FCF

Common Name: Fast green FCF
Suggested Name: Fast green FCF
Other Names:

C.I. Number: 42053
C.I. Name: Food green 3
Color: Green
Solubility Aqueous: 16%
Solubility Ethanol: 16%
Absorption Maximum: 625, 420-430 (Conn) 622, 427 (Aldrich) 628 (Merck)
Empirical Formula: C37H34N2O10S3Na3
Formula Weight: 831.9


Fast green FCF has been recommended as a substitute for Light green SF yellowish in Masson's trichrome. It is less likely to fade and is more brilliant in color. It may be substituted in other procedures as well.

Light Green Homologue

The following three green dyes may all be used as the fibre stain in Masson type procedures. Light green SF yellowish is the most common, although fast green FCF is less likely to fade and is a more brilliant colour. Guinee green is occasionally suggested, but is prone to fading.


  1. R. D. Lillie.
    Conn’s Biological Stains
    Williams & Wilkins, Baltimore, MD., U.S.A.
  2. Susan Budavari, Editor,
    The Merck Index, Ed. 12
    Merck & Co., Inc., Whitehouse Station, NJ, USA
  3. Aldrich chemical catalogue, 1992
    Aldrich Chemical Company, Milwaukee, WI, USA.